diff --git a/pkg/chunkenc/facade.go b/pkg/chunkenc/facade.go
index 24d73a9b8176..0c959a391866 100644
--- a/pkg/chunkenc/facade.go
+++ b/pkg/chunkenc/facade.go
@@ -77,7 +77,8 @@ func (f Facade) Size() int {
 	if f.c == nil {
 		return 0
 	}
-	return f.c.Size()
+	// Note this is an estimation (which is OK)
+	return f.c.CompressedSize()
 }
 
 // LokiChunk returns the chunkenc.Chunk.
diff --git a/pkg/chunkenc/interface.go b/pkg/chunkenc/interface.go
index da4b1e677ded..47b12ba3a454 100644
--- a/pkg/chunkenc/interface.go
+++ b/pkg/chunkenc/interface.go
@@ -111,6 +111,7 @@ type Chunk interface {
 	SampleIterator(ctx context.Context, from, through time.Time, extractor log.StreamSampleExtractor) iter.SampleIterator
 	// Returns the list of blocks in the chunks.
 	Blocks(mintT, maxtT time.Time) []Block
+	// Size returns the number of entries in a chunk
 	Size() int
 	Bytes() ([]byte, error)
 	BytesWith([]byte) ([]byte, error) // uses provided []byte for buffer instantiation